Dave, thanks for the new details on the grids!!!
Inspired by magkelly, i went through our pantry and found a box of triscuit crackers that i thought would make a nice rectangular snoot. I cut a hole in the bottom, slightly smaller than the flash head of my metz 48, and mounted it on a tripod in the vertical position (on top of a cactus radio trigger).
I then used that triscuit box and one flash in my lap to take a self picture of myself in this car. All done on a self timer. The shadows on my face are not very good, but the purpose of this exercise was to see if one could whip together a light modifier for a flash fairly quickly. I would have to say that magkelly is correct.
The cool thing about using the box of triscuits to get the light smeared across the hood of the car, was that i noticed a hard edge on the left side of the hood. So i took a box knife to the left side of the triscuit box and cut two corners so i could fold back the left edge of the box. Presto, i now had a gradual transition on the left edge to the shadows.
So below is a picture of the car with driver. the lighting on the hood is from the triscuit box. The next picture shows the cutout triscuit box rotated 90 deg out of the position it was used for the shot. The tape was used to keep the box in position during thte shoot. it was a fun exercise.
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best wishes,